Use PLC to test the START STOP logic for two inputs and one output.

Aim

Use PLC to test the START STOP logic for two inputs and one output.

Apparatus Required

PLC software, NO and NC switches.

Procedure

1. Load the RS Logix software to the PC.
2. Open the RS Logix software.
3. Switch On the PLC trainer.
4. Open the New project and draw the ladder logic program.
5. Compile the program.
6. Run the Program.
7. Give force and observe the output.

Ladder diagram:

Explanation

Observation Table:

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Result:

When start button is pushed:

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When stop button is pushed:

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Conclusions

1. When Start (NO) switch is pushed, motor will be (ON/OFF).
2. When Stop (NC) switch is pushed, motor will be (ON/OFF).
3. When Start (NO) switch is released after push, motor remain (ON/OFF).

Viva Questions

1. Draw a ladder diagram to switch PLC output high if any of the three inputs is high.
2. Draw logic symbols for NO and NC switches.
3. Draw the circuit for ON/OFF control of motor.
4. List different manually operated switches.
5. What is relay.
6. State the meaning of ladder rung.
7. Draw electrical symbols used to represent switches: NO push button and NC push button.